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Correction: Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells
Yalu
Zou
a,
Hongbin
Chen
a,
Xingqi
Bi
a,
Xiaoyun
Xu
b,
Hebin
Wang
c,
Menglu
Lin
c,
Zaifei
Ma
b,
Mingtao
Zhang
a,
Chenxi
Li
a,
Xiangjian
Wan
a,
Guankui
Long
cd,
Yao
Zhaoyang
*a and
Yongsheng
Chen
*a
aThe State Key Laboratory and Institute of Elemento-Organic Chemistry, Centre of Nanoscale Science and Technology, Key Laboratory of Functional Polymer Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin 300071, China. E-mail: zyao@nankai.edu.cn
bThe State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center of Advanced Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
cThe National Institute for Advanced Materials, Renewable Energy Conversion and Storage Center (RECAST), College of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
dThe State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
First published on 8th August 2022
Abstract
Correction for ‘Peripheral halogenation engineering controls molecular stacking to enable highly efficient organic solar cells’ by Yalu Zou et al., Energy Environ. Sci., 2022, https://doi.org/10.1039/d2ee01340a.
The broader context section for this article was missing. It should have appeared as follows.
Modifying non-fullerene acceptors (NFAs) with peripheral halogenation has been considered as a relatively simple but an effective strategy to boost power conversion efficiencies (PCEs). However, the lack of systematical investigation, especially in the state-of-the-art Y6 series NFAs, makes the bridge between peripheral halogenation in both central units and end groups and molecular stacking, active layer morphology, charge transfer/transport dynamics and device performances of the resulting OSCs a crucial but still unaddressed issue. Herein, based on our previous experience in molecular engineering, a novel series of non-fullerene acceptors (NFAs), CH-6F, CH-4Cl and CH-6Cl, are designed and synthesized, featuring multiple peripheral halogenations in both conjugate extended central units and end groups. With CH-series NFAs, a comprehensive study has been conducted to systematically probe the significant effects of peripheral halogenation on their single crystal packing, disclosing that peripheral halogenation induced completely different crystal systems and quite unique molecular packing modes. Moreover, this superior molecular packing optimizes film morphology, improves photovoltaic performances, and reduces energy losses of the resulting OSCs. Finally, by utilizing CH-series NFAs, a series of highly-efficient OSCs have been afforded with a champion PCE of 18.22% and markedly reduced ΔVnr of 0.203 V in CH-4Cl-based ternary devices. Our results indicate that controlling molecular stacking modes by peripheral halogenation engineering should be a possible avenue toward OSCs with higher efficiency.
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